package cn.com.open.opensaas.baiscommon.util;

import java.lang.management.ManagementFactory;
import java.lang.management.RuntimeMXBean;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;

/**
 * 主键生成器
 *
 * @author nature
 * @create 2017-12-22 10:58
 */
public class KeyWorker {
    private final static long twepoch = 12888349746579L;
    // 机器标识位数
    private final static long workerIdBits = 5L;
    // 数据中心标识位数
    private final static long datacenterIdBits = 5L;

    // 毫秒内自增位数
    private final static long sequenceBits = 12L;
    // 机器ID偏左移12位
    private final static long workerIdShift = sequenceBits;
    // 数据中心ID左移17位
    private final static long datacenterIdShift = sequenceBits + workerIdBits;
    // 时间毫秒左移22位
    private final static long timestampLeftShift = sequenceBits + workerIdBits + datacenterIdBits;
    //sequence掩码，确保sequnce不会超出上限
    private final static long sequenceMask = -1L ^ (-1L << sequenceBits);
    //上次时间戳
    private static long lastTimestamp = -1L;
    //序列
    private long sequence = 0L;
    //服务器ID
    private long workerId = 1L;
    private static long workerMask= -1L ^ (-1L << workerIdBits);
    //进程编码
    private long processId = 1L;
    private static long processMask=-1L ^ (-1L << datacenterIdBits);
    private static KeyWorker keyWorker = null;

    static{
        keyWorker=new KeyWorker();
    }
    public static synchronized long nextId(){
        return keyWorker.getNextId();
    }

    private KeyWorker() {

        //获取机器编码
        this.workerId=this.getMachineNum();
        //获取进程编码
        RuntimeMXBean runtimeMXBean = ManagementFactory.getRuntimeMXBean();
        this.processId=Long.valueOf(runtimeMXBean.getName().split("@")[0]).longValue();

        //避免编码超出最大值
        this.workerId=workerId & workerMask;
        this.processId=processId & processMask;
    }

    public synchronized long getNextId() {
        //获取时间戳
        long timestamp = timeGen();
        //如果时间戳小于上次时间戳则报错
        if (timestamp < lastTimestamp) {
            try {
                throw new Exception("Clock moved backwards.  Refusing to generate id for " + (lastTimestamp - timestamp) + " milliseconds");
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        //如果时间戳与上次时间戳相同
        if (lastTimestamp == timestamp) {
            // 当前毫秒内，则+1，与sequenceMask确保sequence不会超出上限
            sequence = (sequence + 1) & sequenceMask;
            if (sequence == 0) {
                // 当前毫秒内计数满了，则等待下一秒
                timestamp = tilNextMillis(lastTimestamp);
            }
        } else {
            sequence = 0;
        }
        lastTimestamp = timestamp;
        // ID偏移组合生成最终的ID，并返回ID
        long nextId = ((timestamp - twepoch) << timestampLeftShift) | (processId << datacenterIdShift) | (workerId << workerIdShift) | sequence;
        return nextId;
    }

    /**
     * 再次获取时间戳直到获取的时间戳与现有的不同
     * @param lastTimestamp
     * @return 下一个时间戳
     */
    private long tilNextMillis(final long lastTimestamp) {
        long timestamp = this.timeGen();
        while (timestamp <= lastTimestamp) {
            timestamp = this.timeGen();
        }
        return timestamp;
    }

    private long timeGen() {
        return System.currentTimeMillis();
    }

    /**
     * 获取机器编码
     * @return
     */
    private long getMachineNum(){
        long machinePiece;
        StringBuilder sb = new StringBuilder();
        Enumeration<NetworkInterface> e = null;
        try {
            e = NetworkInterface.getNetworkInterfaces();
        } catch (SocketException e1) {
            e1.printStackTrace();
        }
        while (e.hasMoreElements()) {
            NetworkInterface ni = e.nextElement();
            sb.append(ni.toString());
        }
        machinePiece = sb.toString().hashCode();
        return machinePiece;
    }


    public static void main(String[] args) {


        String a ="123456";
        System.out.println("--UUID="+a);
        System.out.println("--a.hashCode()="+a.hashCode());
        int hashcode = Math.abs(a.hashCode() % 10);
        System.out.println("--hashCode="+hashcode);


//        for (int i = 0;i < 1000;i++){
//            String a = UUID.randomUUID().toString();
//            System.out.println(i+"--UUID="+a);
//            int hashcode = Math.abs(a.hashCode() % 10);
//            System.out.println(i+"--hashCode="+hashcode);
//        }




//        int zero = 0;
//        int one = 0;
//        int two = 0;
//        int three = 0;
//
//        for (int i = 0; i< 1000;i++){
//            System.out.println(i+"---"+KeyWorker.nextId());
//            System.out.println(i+"---%10="+ KeyWorker.nextId() % 10);
//            long l = KeyWorker.nextId() % 4;
//            if(l == 0){
//                zero++;
//            }else if (l == 1){
//                one++;
//            }else if (l == 2){
//                two++;
//            }else if (l == 3){
//                three++;
//            }
//        }
//
//        System.out.println("zero="+zero+"---one="+one+"---two="+two+"---three="+three);
    }
}
